Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55dccbc2d6b5ea11db4a415679bbe25cb26057276890b10080406776e5e88223' 
  AND token = 'xcarC03dCRIyidv83y8yl6uKsmLDucyL2u/2EFYJHHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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