SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93badc3694c5e56e71dc42ee7cff4d57c3222029588f0686fbe03a6ab7d3e31' 
  AND token = 'ZoCO7H/ako5HPTc+2fWXv3BGAqKyLLRq5jSNpX0nTmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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