Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e8bcf5eed751240be8023c8b3ac9776cb04e148bf9f238c6f962ac56a3cd0e' 
  AND token = 'd3fsFzw5hhphNikxnqsZHO6ug+CuESxzvzNXoT2x7VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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