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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f5e48dc710897fed62889b2c9008a0fc7aa869087cb4fe6f0876a080368ee2' 
  AND token = 'TiEkVjDwZBMrcsm1Adf+XxzgC87bZJFIPnA+kH4oRHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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