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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fee56663eda3d95e3ae0cf507b02c8b9d093939700ae2b9d4d45aab8318d18' 
  AND token = 'bGVz1r1Paly8CQ9DdGG1q6pEUUz+YqOnmkDlF9y6WsQ=' 
  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"
    }
  }
}