Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa51f8768b4a152b455e1163acc5542cae2e2b380ee61a1fc9d8f07f7145d4b2' 
  AND token = 'pHhUZR2ltlMfMvdlA4jft0Hj4nquir28UaaltAoo1c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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