SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee368518232da077b727d35b0f49c2fa8f900f3b443ca8786c7e4c6d6d948c4b' 
  AND token = 'aBI+U8P8DiNQqRGHqjrh53raRjGop6vF5x0H9/rXULQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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