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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79717da62ba55fc8322954b87b6373e98c107c0df234d1dbafe01092dd99195' 
  AND token = 'off1JzAmSmbzmK/U4wH7KwaawUcNjZlZgPwGOt8yW1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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