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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f420729401b21583311f9e2cc5a4307479733adbdedcc3f16f3ecf8454dd792' 
  AND token = 'q0ERwnobyg6cYGH8THJXJGqpaf2raFSm9+u63NeTzhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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