Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50897040ca19c3c1c4515679c72cfde4d484404972f9469984b7cfdcaa4c0a2f' 
  AND token = 'ZTSX3Eyw5ss16s01tNuLb5m2HBNJxo4/mQp/yX/dquc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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