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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '455bc35c2daa7d819a3c7e64d1c9af3e181e7d44a10aa2494f3dc02e20cb0e77' 
  AND token = 'Vu+p3fN9doPMmDgpHDoP3SWGczQzKKKccvvPqtmW4wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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