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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff28f74ea37e8e320de13f05ffb4185e1e415c072486e128310a0e6bf22127b' 
  AND token = 'tFuWwJRmir7gDQ0fYtxBmJqaXu65fxMqsx/ydCH5LhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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