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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df454d9e451b306e0b682cdcd9ce0a3de41a8ca760a20b61bc0b2415527d4a1f' 
  AND token = 'ZXxDbkImrUA5o6Mroh3cuLDlY9BbtnSlaTQcp2WNRaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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