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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '355b4834a6a88bcf045799a6ae707113bcfe46b711d7ae1110d09910a5eabe41' 
  AND token = 'PJI7RVSEizys4pcnzd8DpXTX+mkOTfu3KfO0zulhjzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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