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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d31d76afd9469b8ee23524494d5c23a0dbca202facc363bbd845e6b1daf6222' 
  AND token = 'NRVTlL6yEa50qSaw0a2rbvJk2NlxjuozFpjKxTPb+SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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