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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34be26613b68b6d81f8865506a89b7eb48275cd083e4fa3b74402116c69f193' 
  AND token = 'xHed2hRd5RQIk+o26V0WR8qV80ic32dZDsgu4EhSRHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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