SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77aec855e9779da6abd6bb95daa81833bb2425b4609f54e1ff214a0ed89294c' 
  AND token = 'YRFvDKf9cD+80M+OTpACBs9LBJdVNzV4GAkr7hsq9ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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