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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489cc8eb7b91ff0132de1f71938d031359403e2d4436647edf6bd3a74521e5f8' 
  AND token = 'etfpVpbhBeax6vGcGeEI7kr5l9oeQwhT2vwl2JavbOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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