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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2718770e0614a8de5766a042239da4c4f69c53176237cd1ac5066a176c472ccd' 
  AND token = 'nYbKDlbfkG1rOw/e6V6FGUD1eHTDunOFmCkJJEufyKE=' 
  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"
    }
  }
}