Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1003d5e8a9a82c97441d31f7cf469e0cefc5379756e1bf2f4e0b002952fc3460' 
  AND token = '8liHMk35gkdhuKsWXxph164me2q9MzmyDD3aIR7XBmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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