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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba907da2693ad870e5cf3b896fc0c8f3b1eb833938ae70f75e0a0df217a9e17' 
  AND token = 'hQu+LwkEAlYx9pQtx2xs4Im6jyh7TvN2FZYUlukV4A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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