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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0914d6efc290501ebfcf2e22fb7c5ccc3306963317b839e85bd7fd061ff6a0d4' 
  AND token = 'EtFkyGXEJluGRSy8DnTzsCTD2y1svRy4fqKzZit0Ilk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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