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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a6d0ac782d0acc44a507e735eed76e78a10a21a0947f90e9bfb6432945f699' 
  AND token = 'QmCZEpQv0H4xwRzXnTEUl6ICN51bZkhmqv5R9T8CX4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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