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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575a61d943a7cf198d90a85e966ff285f96c691f146636510f1546ae1f6bcc63' 
  AND token = 'EnLEVMFcLuh2bPi1OaU3GIJqZ6Jmir70dP7RMdryyeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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