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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47efaf356d0b39d42450d9a67fc1d5def54f08918cfa0c191ccef54caf41d7f' 
  AND token = 'mbtfahvEpa/zJqbC5H38/b4p14zIPeUeCILeJXYPkTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}