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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a72e5ff08c74e738ca961fce2a28d1a44115f1747c25f82543cc7b08699e8b' 
  AND token = '9YgDC6RjStNCy2/XhDc93jx3BQbYG0XtUXJjl6gPjAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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