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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbcbd97a5a55e2afe928b2a5c9c72fed943091a2a8ba4fb64e96f95c662039c' 
  AND token = '9StHwODfV9qN+n4hv3iGIatw0gVrawqOdXNTc+pIw4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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