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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116590da145b08e41f85205d254017337a1ed4e15555d18b1a74b7e5e557b1cd' 
  AND token = 'It3ikx5rUGhQEyvetEuh0ZZNj3MPPGPjXWZOPxZ7vnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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