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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e44b68634ef62feac763f40d0e163baabe8dfb31802de08ff8704e36ba4d6d' 
  AND token = '8/gWz95J6FQRdmt1O6TamWl9XrI4y/aDVuYhhmKU1bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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