SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24586ac8433bf2bce8bf728feae44d6f219eee02cd0155d8545702d85afddcf' 
  AND token = 'Zzipi5zH7BIMV/Q6XjCwPFpMeNZMOPYVsIlDtsfxHhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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