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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54fc69b798a50b78b5ebe6e545ce43812be3645623cf7a35b40701bb731c149' 
  AND token = 'FjP5eMXjxkkFxKjsfpafuTrcgShhKLH66OrswU+yazM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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