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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6657e44338dfa7230d44dd4744cdebd96aa0e26d7a6cfa1e9d847e87aea840' 
  AND token = '2Q45fo/lkVv0Q5Oy9hxQGSL1bt51O4yaVhN96IWYxBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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