Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5474ddffbe8d6c62028b2a16dd3b60d100af9ea7d5b34b0585750140ab6551' 
  AND token = 'V3n4ZPcLlpQ/dMrJ2V/7PUs6oYa13NQH6wqzutvFLtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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