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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc319b600452773dff08b71459f6d9465be3f677a4d1d9f4402935a19058203b' 
  AND token = 'cBU8PNZfSza6jKT6R5XzMkj4Aoni1aB0O9nN1aruj10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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