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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1c14722fc7aa48665f53db3f75c948ea4b8d11c163ed4342f3bcc630e7a108' 
  AND token = 'cAUEt6qmMNUqYDgA2l8zaZrs9rEW3XF9N5FFUi5fdmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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