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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d9350a3388532f96d5eeaddb8f2c1b12c91f0552ae67fe4c11cebbe626fa6a' 
  AND token = 'KlwVHy0bn30SJ+XyFrc5M+1h8limFIoSbzGk/VIOWKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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