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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb34dcc5ddafc2ea0a8145f4dec33a85d46df9add203909fd636a79e92224fa' 
  AND token = 'xt85CrCBXKWivCRxLSsJrPM+GHwd7PjM5BlktlaFvcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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