SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334820114b19ef68e37f2458a023acf4bf7a7f23924494b1137551bf1650f2f1' 
  AND token = 'zw4COQEZVBQS8nWJyIy3n/RejGGRpEgk9wVSpA7HvPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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