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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c8d02c2e8f36061c2399a90c93081adbe0201b2ec57eff70881ba3d52d7d94' 
  AND token = 'MHgxIEK0jLeEZC+07HYLZrYkUX1Pj/6356AxgG0seD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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