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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b803454dabc138343d39d217e9f4dd9a0370e2f654b325735afeb7e24fafab' 
  AND token = '1TRY3Z/yZBgY7VQ1gE0mUYQkz7PP0oYiZV/PaalWp6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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