SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ad2d1dab9cd154203ba7e74ca59d807d72bd87d578e737650069a4cb5f687d' 
  AND token = 'WIu7GFPaH7rBNDJk6oXYwsJZrzl4iwhq4xyKYxJfskg=' 
  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"
    }
  }
}