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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142d73027fe44fa9cd0b4fa66cf77f1f942a873bd6eef2aaa8648609c82bf54a' 
  AND token = 'VS79+g3XdN5pA9lV75s8Hyb8cmOOCnwNF4usoCSV+4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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