Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e0d1a0c91b694c590ce47a80c16c0bd0088921fd819e2cc2114262ee784cd9' 
  AND token = 'D5jVS7EPaWk8XifTdZl+EArzzTmXmWRhyspS8O/60ws=' 
  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"
    }
  }
}