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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8627c150d06337d0db60351499f62496fc5f9a24472d8d7a2b03d88e1db119' 
  AND token = 'LaQxlu1GqHbonN9BoAHtceGz96Yom18QpbTGFds9FZ4=' 
  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"
    }
  }
}