Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6caf9a0808f9ea96dae4449b85c47ec1ff01b21a17d86112d22ce74b5b51afa0' 
  AND token = 'RYiFlMIu4aXL5SA0xZtVs5agZvRqcE55z6jcAgtnJb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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