Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca305232a0f139f512f243b3e365ceb17ea97cbea2fbfc9411169b1cb13fb238' 
  AND token = 'A6hKzbN0EqqBpkTnRIkIT3glVrKgZ60Q96K4DuR1q8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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