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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9b92517d0884454ea268041ee859858e7ee920f780fa03703d0dc21514e012' 
  AND token = 'tkAGyPYSF2W+YVd12jZj5ZQKeUXGl3N8nczfIZ3Hxy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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