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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f34ae7609955d44d05b05e4c09e48ec1007eb49d120bcc7c45f83d6441d057' 
  AND token = 'lRKQUCjGBxUEhlBFK8MF3T8PUvO3H2BpO9G/I/sskug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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