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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffe9cf45ac8289901d96c4852b5107fee18ab7cc1b7dcc8b49c3fac12a8bcd5' 
  AND token = 'rq0Sa1bGb1oVcf6EJ6bFA1arckl5ttD2+dumj8btgiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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