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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88e16bdc3b40a4e888229ee7bcc77209c6bea3ced4f027ae5e280a290321736' 
  AND token = '3eRc1BCBhxsc+O3r9MSGDHq/gv4HuXNDjgzGBUEavGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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