Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cce5277747de400e88763ce42c0e96c6bd8aad317d40038f099314126501b99' 
  AND token = 'WDKaFee4cQanFTSak5CxyFILmgwPKwx2rvPX2RDnY0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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