Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a951ec62adae896c3de855252b3ad40690237c1c30c21c5a1f1b0500a39889' 
  AND token = 'fz0/1xk/EX81fDt9xx07RNwIymL+3XWInoJT8A9+Moc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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