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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5a4d5b0268b28e61ab2937eb3f4545a18e03019a449e7312389244ed0771bd' 
  AND token = '9NzfzJlatUdNyW1mCU7ipbJnSrVXBZ5ArcYhQC15IHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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