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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d6f3ca90f6e6e02c7122064e55a5f2c004dd96f96a85b46cb7e6ec02480fa6' 
  AND token = 'Stq6iS9utaPJSt35xIDtNkZSkH0/e/izzlaxZsTtTrw=' 
  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"
    }
  }
}