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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c3569fdc7c39362ffee6bdbba6a9d73542f85c2d1be74a33a9d77e2e70155f' 
  AND token = 'xgm0msZGIT2xJBX2OJAGA1bnnYaLI7t6sczg7gDuMAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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