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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889f2350c03fe5191105ab9f312b3a135e1b101269c405d44c7e3e9b57885a9d' 
  AND token = 'sbHSKJjRkpC+EZ9UBSJEAeSIjInD+WBdrWAj9xPg9og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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