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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b340e57bd44ec40df0c5a544ace808089e024da984544f8d9fa99cf733f6d818' 
  AND token = '1TQtit4D7gsFzev0DxPfm1bzEvMnW283/koqhfxkm9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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