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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f30e10f2cc12ee1308f27668c113baec2f6e01d9c7821103e7020a57748874' 
  AND token = 'tadLOSZ5v0uS8SsH9ZCjmppWxG+bi5O1Qk2JLJKCKZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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