SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ded4eeecc4f184b2f1fbd9719e4717beba9d076a4f24fb486922963f3231a2' 
  AND token = 'nPAmiNL/C5J0o/ojFVF5uVBQSWSzmSxPAOjZjKvH57s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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