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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7e9884a380e3d9ba0730cbf6920668c628dc8a301a6fd732a629ef7433924e' 
  AND token = 'A8n4/dAwEcn6Qp+UlJsAzZ+ooAHuNi1/fD/+2W+hiMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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