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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259d1fe4eba6da0f8a2690df511bffe1a5b14ea0002728cad163e276ee5199a1' 
  AND token = 'v/0uzucuSlH+h+CxgerbK06HrQ2zHz0rrkZoLvDTbYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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