SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed93b20e43d21c148f6b3584d49040273f6cc39b6563879a6c470a29cdfaf382' 
  AND token = 'JdecUNRDeeZ1DkhvxRZpR+GMurzWugAH/DgHGY+ThLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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