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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bf449c9bd14b6c61f22ef7b30ad52079de1555781a1541b2ea047ade07931f' 
  AND token = '46ZNs58a8RUc9/n8WrMMYFc2cQQ9TZqw3nmqL/0n+0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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