Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab3c060f1a9204b10fa95c7afbb53ab8c56c0900079a2c69f25e72cd885f91f' 
  AND token = 'MQaz1i/r5vK4cCyppIUXc0nbpkJqvzVJXw6/f0AZppo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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